Sliding door lock



C. PIRTZ SLIDING DOOR LOCK March 3, 1942.

Filed April 2, 1941 2 Sheets-Sheet l TIL In ventor A Home March 3, 1942.

C. PIRTZ SLIDING DOOR LOCK Filed April 2, 1941 2 Sheets-Sheet 2 II I l Inventor z 6/94 3255 P? r:

B; @mwih Q Patented Mar. 3, 1942 UNlTED STATES PATENT OFFICE SLIDING DOOR LOCK Charles Plrtz, Woodslde, Long Island, N. Y.

Application April 2, 1941, Serial No. 386,529

' spindle and shrunk or otherwise secured thereto Claims.

This invention relates to closure fasteners, and more particularlyto door locks.

An object of the present invention is to provide a door lock that is particularly adapted for use on a sliding door, or an analogous closure for substantially automatically locking the closure in closed position as it moves into such position. Further, an object of the invention is to provide a lock of this character which may be either set into the body of the door, or mounted on the door at either side thereof as found desirable. v

The invention, together with its objects and advantages will be best understood from a study of the following description, taken in connection with the accompanying drawings, wherein:

Figure 1 is a fragmentary side 'elevational view of a door showing the lock, somewhat diagrammatically, set therein.

Figure 2' is an edge elevational view of the door equipped with a lock in accordance wit the present invention.

Figure 3 is a top edge elevational view of a door equipped with a lock embodying the features of the present invention, and with the door jamb shown in horizontal section.

Figure 4 is a vertical sectional view through the door with the door in fully closed and locked position, and illustrating the application of the invention.

Figure 5 is a horizontal sectional view taken substantially on the line H of Figure 4.

Referring more in detail to the drawings it will be seen that in the preferred embodiment thereof, the lock embodies a casing 5 that maybe either mounted on one side of the door, or as so as to turn with the spindle.

A bolt or locking element i2, adjacent one end thereof, is provided with an integral annular collar l3 that is sleeved on the bushing i I so that rotative movement of the spindle 9 is transmitted to the bolt or locking element 12 for raising and lowering the latter; the collar iii of the bolt or locking element I2 being shrunk or otherwise secured to the bushing II.

At the outer end thereof'the casing 5 is provided with a vertically elongated slot l4 that accommodates the hook end I5 of the bolt l2 as shown.

Mounted in the top portion of the casing 5 are guide elements it and it through which a rack bar I! and a locking bar i8, respectively, have a sliding working fit.

At the confronting ends thereof the bar members I1 and iii are accommodated within the opposite ends of a tubular member i9 that houses a spring bearing on the inner end of the bar member I1 that is fixedly secured within the tubular member 19 and also on the inner end of the bar member l8 accommodated by the tubular member and normally urging said members in reverse directions relative to one another.

For the locking bolt or element [2 there is slidably mounted in the casing 5 a hold-down element 2| and the free end of the lock rod i8 is notched as shown to provide an extension 18a that is movable into and out of position within the path of the hold-down element 2|, and a I fitted upon and shrunk or otherwise secured to shown, set in a suitable recess provided thereof door as is somewhat conventional.

Provided in opposite sides of the door are suitable apertures to accommodate the respective opposite ends of a knob spindle 9 equipped at said ends with handles Ill-40.

The knob spindle 9 extends transversely through the casing 5 and intermediate its ends is provided with a bushing II, the opposite ends of which are journaled in suitable openings provided therefor in the opposed walls of the casing 5, and said bushing H is fitted upon the knob the rotating barrel 24 of a lock indicated generally by the reference numeral 25 and hereinafter more fully referred to.

The teeth of the rack bar ll are .in constant mesh with a rack wheel 26 rotatably mounted in the casing 5, and a vertically shiftable rack bar 21 has the teeth thereof also in mesh with this wheel 26.

The rack bar 21 works in a suitable guide 28 provided therefor in the casing and has a cam end 29 that coacts with a cam end 30 on a cam rod 3!.

The cam rod 3| .works in a suitable guide 32 provided therefor and has an end secured iwitmn a sleeve 33. Interposed between the guide 32 and one end of the sleeve 33,"and convoluted about the cam rod 3|, is a spring 34 that acts to normally urge the rod 3| and the cam end 30 thereof away from the cam end 29 of. the rack bar 21.

A pressure-responsive, elongated push button 35 has one end working through an opening 36 provided in the end wall a of casing 5 and a second end slidably accommodated within the sleeve 33. Interposed between the inner ends of the push button 35 and the cam rod 3|, and housed within the sleeve 33, is a coil spring 31 that normally acts to urge the rod 3| and the button 35 in reverse directions relative to one another.

The push button 35 inwardly from the free end thereof is provided with a collar 38 that acts as a stop to limit the outward movement of the button 35 relative to the casing 5.

At one side of the spindle 9 the locking bolt or element I2 is connected with the aforementioned sleeve |9 through the medium of a coil spring 39, while at the opposite side of the spindie 9 the locking bolt or element I2 is connected with the sleeve 33 through the medium of a coil spring 40. a

When the door A is in\closed position, the bolt or locking element I2 is engaged with the keeper 4|, as best shown in Figure 4.

When the door is in its closed position, it is held locked in such position by reason of the end |8a of the bar l8 disposed over the upper end of the hold-down element 2|, which in turn is in the path of the vertical swinging movement of the locking bolt or element t2, as shown in Figure 4.

To unlock the door from one side thereof, a key is inserted in the lock to turn the barrel or spindle 24 thereof. This causes the crank 22 to move into engagement with shoulder |8b of 7 bar l8 forcing the bar inwardly against the action of spring 20 and moving the end |8a of the bar out of the path of the hold-down 2|.

At the same time this movement of the bar i8 is. transmitted to the rack bar causing the wheel 26 to turn. The turning movement of the wheel 26 causes the bar 21 to move downwardly so that the cam end 29 thereof coacts with the cam end 30 of thecam bar 3| to move the latter together with the sleeve 33 against the action of spring 31. This consequently results in an outward pressure being exerted by the spring on the push button 35 to project the latter through the opening 36.

As the key in the lock 25 is being turned, the operator, by grasping the handle I0 on the corresponding side of the door, rotates the spindle 9 to raise the locking bolt or element l2 out of engagement with the keeper 4|, thus completing the unlocking of the door so that the same is then free to slide to an open position.

When the door is in an open position and then moved to a closed position, the projected end of the button 35 will engage the keeper plate 4|, causing the button 35 to move inwardly of the casing 5. This inward movement of the button 35 will be transmitted to the cam bar 3| so that the cam ends 30 and 29 of the bars 3| and 27 coact to move the bar 21 upwardly for rotating the wheel 26 in a clockwise direction. Rotation of the wheel 25 in this direction will cause the rack bar I! to move inwardly of the sleeve l9 and this movement of the bar I! is transmitted to the lock bar 3. Consequently, as the door reaches closed position and the hook end i5 of the locking bolt or element l2 snaps into'engagement with the keeper 4|, the hold-down bar 2| will move downwardly and the end |8a of the bar l8 return to position in the path of the holddown 2|, or, in other words, the parts, upon complete closing of the door, return to the position shown in Figure 4, and in which position of the parts the door, as is obvious, is locked, the locking bolt or element |2 -being thus prevented from swinging upwardly for disengagement from the keeper 4| until the locking bar I8 is retracted in the manner hereinbefore described.

It is thought that the manner in which the lock operates, together with its many advantages, will be .clear to those skilled in the art without further detailed description.

While I have herein illustrated and described the preferred embodiment of the invention, it is to be understood that I do not wish to limit myself to the specific embodiment herein illustrated, since those skilled in the art may make changes therein without departing from the spirit of theinvention.

Having thus described the invention what is claimed as new is:

1. A lock mechanism for sliding doors including a locking element mounted .for rotative movement, a hold-down bar mounted for sliding movement above said locking element, a lock bar mounted for sliding movement above said I locking element and having an end normally projected in the path of said hold-down element above the upper end of said hold-down element,

ing bolt and, arranged in the path thereof for' releasably holding the bolt in the downward locking position, a lock bar slidably mounted for movement laterally with respect to said holddown element and projectible into and out of position in the path of the hold-down element above said locking bolt, a rack bar operatively connected with said look bar for shifting the latter into projected position across the path of said hold-down element, a driven rack wheel having the teeth thereof in mesh with said rack bar for shifting the latter in either of two directions, and operating means for said rack bar for rotating the latter incidental to the opening and closing of said door; andthe connection between said rack bar and said lock bar being such as to permit limited movement of the one relative to the other, and a key-operated lock mechanism embodying means engageable with said lock bar for retracting the same to a position out of the path of said hold-down element.

3. In a lock of the character described, a locking bolt mounted for vertical swinging move ment, a hold- -down element mounted for sliding movement above said locking bolt and in a plane perpendicular thereto, a lock bar mounted for sliding movement at right angles to said holdmechanism embodying a part engageable with said lock bar for retracting the same to a position out of the path of said hold-down element.

4. In a lock of the character described, a locking bolt mounted for vertical swinging movement, a hold-down element slidably mounted above said locking bolt for movement in a plane perpendicular thereto and arranged within the path of said locking bolt, a lock bar mounted for sliding movement in a plane at right angles to said hold-down element and adapted to be projected into the path of said hold-down element above said locking bolt for coaction with the hold-down element to secure the locking bolt in locking position, a key-operated lock mechanism mounted in operative position to said lock bar and embodying a part engageable therewith for retracting said lock bar, and mechanism for projecting said lock bar into the path of said holddown element including a'rack mechanism operatively connected with the lock bar.

5. In a lock of the character described, a locking bolt mounted for vertical swinging movement, a hold-down element slidably mounted above said locking bolt for'movement in a plane perpendicular thereto and arranged within the path of said locking bolt, a lock bar mounted for sliding movement in a plane at right angles to said hold-down element and adapted to be projected into the path of said hold-down element above said locking'bolt for coaction with the hold-down element to secure the locking bolt in locking position, a key-operated lock mechanism mounted in operative position to said lock bar and embodying a part engageable therewith for retracting said lock bar, and mechanism for projecting said lock bar into the path of said holddown element including a rack mechanism operatively connected with the lock bar, a push-button assembly mounted below the locking bolt for sliding movement, and coacting cam means on said push-button assembly and said rack mechanism for actuating the latter to cause a projecting of the lock bar incidental to the closing of the door, and a projecting of the push-button mechanism incidental to the opening 01' the door.

CHARLES PIRTZ. 

